Answer:
Ca generally loses two electrons from its outer shell to form a Ca2+ ion.
4 sig fig in that expression
Statement 2 is correct.
solids moving into solution is a physical change as the core structure of the molecules remain the same. evaporation of water and crystallization of salt are both physical changes as well.
The water does not change it's H2O chemical makeup because salt was dissolved into it.
Somewhere in the Orange to red range
Explanation:
Equation for Calcium Hydroxide Dissolving in Water | Ca(OH)2 + H2O